如何将嵌套 json 对象映射为实体

Question

我正在调用另一个 api 并得到以下 json 响应

{
    "metadata": {},
    "data": {
        "productId": 102001,
        "productName": "P101",

        "brandDetail": {
            "brandId": 3840,
            "brandName": "ABC",
            "brandCode": "X01"
        }
    }
}

如何解开品牌详细信息并将其作为类实体读取，如下所示？

BrandDetail brandDetail = objectMapper.readValue(entity.getContent(), BrandDetail.class);

提前致谢

Answer 1

使用

convertValue()

，这是一个测试。

@Data
public class BrandDetail {
    private int brandId;
    private String brandName;
    private String brandCode;
}

@Test
public void demo() throws Exception {
    ObjectMapper mapper = new ObjectMapper();
    var data = """
            {
                "metadata": {},
                "data": {
                    "productId": 102001,
                    "productName": "P101",
                    "brandDetail": {
                        "brandId": 3840,
                        "brandName": "ABC",
                        "brandCode": "X01"
                    }
                }
            }
            """;
    JsonNode node = mapper.readTree(data);
    JsonNode brandNode = node.get("data").get("brandDetail");
    BrandDetail brandDetail = mapper.convertValue(brandNode, BrandDetail.class);
    // BrandDetail(brandId=3840, brandName=ABC, brandCode=X01)
    System.out.println(brandDetail);
}